An integrated-circuit version of the Dolby Pro-Logic surround-sound system is presented. The IC described is the most complete analog implementation to date of Pro-Logic on a chip, and contains all of the core functions for Pro-Logic including autobalance, noise generation, the active decoding matrix and center channel mode control. The chip is capable of three or four channel decoding mode, and provides a bypass for normal stereo. All modes are controlled by a parallel digital interface which is TTL or CMOS compatible. The chip contains thirty op amps, ten low-noise VCA's, a new circuit element called an operational conveyor amplifier, two dual-output rectifiers, two log-difference amplifiers, comparators, random logic and a digital noise source. It is implemented on an advanced BiCMOS process with complementary MOS and bipolar transistors, oxide capacitors and laser-trimmable thin-film resistors. The IC contains approximately 2000 devices and utilizes 54,000mil squared of area.
Author:
Henry, Peter S.
Affiliation:
Precision Monolithics, Inc., Santa Clara, CA
AES Convention:
89 (September 1990)
Paper Number:
2944
Publication Date:
September 1, 1990
Subject:
Reproduction of Spatial Sound
Click to purchase paper as a non-member or you can login as an AES member to see more options.
No AES members have commented on this paper yet.
To be notified of new comments on this paper you can subscribe to this RSS feed. Forum users should login to see additional options.
If you are not yet an AES member and have something important to say about this paper then we urge you to join the AES today and make your voice heard. You can join online today by clicking here.